Tool apparatus



June 21", 1949. ,1. OAKLEY 2,473,815

TOOL APPARATUS Filed Dec. 13, 1945 M Wanda Patented June 21, 1949 UNIT so STATES Parser Price T'OGDAPPARAT'US John Oakley, Springfield, Mass.-;-assignor;to Perkins Machine and Gear Company, West Springfield; Mass, a'corporatio'n Massachusetts Apislieantnmec'emter 13, 1945;sefiarN6: 6343737 2 Claims. (o1. 29"-95'."1)

This invention relates to" tool apparatus and is directed more particularly "to-tool apparatus for forming alternate slots and'teeth' on circular objects such as a=gear blank:

The principal object's-of 'the'inventi'on are directed to a tool construction which is characterized by a plurality'of cutting members 'which'are held together in stacked relation: and have openings therethrough which are'provided With'peripherally spaced cutting "teethso'thata gear blankmaybe passed therethrough 'for forming alternate peripheral spaces and" teeth. I According-to the inventi'on;=-the' cutting members have-cutting-teeth"integral therewith so astoprovide a strong rigid' structu'ref whereby to" obtain accurate results while' atf the same time the"cutting-member's are readily and easily assembled" and disassembledtofacilitate conditioning ."of'said members.

With the foregoing and various otherflnovelf features and advantagesan'd other objects of my invention as will become more apparent-as out in the claims hereunto annexed and-more fully described and referred to inconnection with the accompanying drawings wherein:

Fig. 1 is a longitudinal sectional elevational" view through --a tool apparatus'embodyingthe novel features of the invention;

Fig. 2 is a sectional plan'viewon' the line 2-2 of Fig. 1;

Fig; 3 is a side elevationat'view'oi one"of.th=e cutter members of the invention; and

Fig. 4 is a sectional plan View on the line 4-4 of Fig. 1.

Referring now to the drawings more in detail, the invention Will be fully described.

A support or holder 2 is provided which has a longitudinal cylindrical bore 4 extending therethrough with an outlet 6 at the lower side thereof. There may be a flange 8 on the lower end of the holder if desired.

A plurality of ribs I0 extend inwardly of the wall of the bore of the holder and supporting means is provided in the lower portion of the bore which may include a plurality of abutments I4.

Cylindrical cutter members I6 are provided and inner adjacent faces of the ribs ID are formed to receive th members It in such a manner as to hold said members in accurate alignment in the stacked relation shown.

Z. The cutter members It each' have a central opening therethr ough which-is provided with circumferentially' spaced inwardly extendingcutrting teeth-" l 8 *having :upper cutting-edges 0n the-upper-sides thereof.

Each-=cuttingmember l6 is provided omits lower face with peripherally spaced downwardly extending bosses zit-which rest-onthe cutting memberthereb elow and provide passageways or i outlets-22 therebetween which are in communicationz vvith vertical channels 24 formed-by the peripheriesof-the cutting members and wall ofthe-bore betweenthe ribs l0.

A oap tll-is secured to the upper side am holderfbysorews 32 or the like and it is provided with bosses 34 which bear-on the uppermost cutter'member l6. v

Keyssuchas 3t -fit in grooves provided'in opiposite sides'ofthe'cutte'r members and-prevent relative rotation of the said members when in thestacked relation shown. I

The-cap 30 by means of the screws-32 or other means exerts pressure on the stacked cutter members while the keys 36 1101a "said members against rotation all to the end that a strong rigid structure is provided.

The cutt-ing members having the openingstherethroughprovide an elongated; opening through Which-a-circular-object maybe passed;

--the entrance theretobeing a hole' 36" in-the cap 30. The inwardlycextending cutting-teeth of the members l6 provide longitudinally spaced rows of cutting teeth arranged so that the'teeth of the successive cutters project progressively in awardly"relative-to the entrance of the opening.

An obi ect such *as -a--gear blank is-:inserted' in the opening 36' of the cap whichisof 'a'diameter to slidably receive and guide a member such as a gear blank to the cutting members.

The blank may be passed through the openings in the cutter members by pushing, pulling or by any suitable means and the apparatus may be operated in horizontal, vertical or any position desired.

The cutting teeth are arranged so that each cutting member removes a small amount of stock or takes a light cut so that the forming operation is fast without impairing accuracy.

As the blank passes through the cutters it emerges with peripheral alternate slots and teeth of the size and shape according to the cutting teeth. As the blank is passed through the cutters the stock removed therefrom or the chips formed in the operation pass outwardly through the passageways 22 into the channels 24.

In some cases it may be desired to provide openings in the wall of the holder for the passage of chips from the channels.

Altogether the apparatus provides an eflicient means for quickly and economically forming teeth on a gear blank and the cutting teeth of the members It may take any form desired.

The invention may be embodied in other specific forms without departing from the essential characteristics thereof. Hence, the present embodiments are therefore to be considered in all respects merely as being illustrative and not as being restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all modifications and variations as fall within the meaning and purview and range of equivalency of the appended claims are therefore intended to be embraced therein.

What it is desired to claim and secure by Letters Patent of the United States is:

1. A broaching apparatus of the class described comprising in combination, a self supporting unitary holder having a longitudinal bore therethrough, supporting means in the lower end of said bore including a plurality of circumferentially spaced abutments extending inwardly from the bore, said bore of the holder provided longitudinally thereof and above said supporting means with circumferentially spaced inwardly extending projections the innermost sides of which are formed to cooperate and provide a circular axial guideway for cutter members and are arranged to space the sides of cutter members from the sides of said bore, a plurality of cutter members in stacked relation in said bore supported by said supporting means and held in axial alignment in said guideway by said projections whereby the sides of the cutters are spaced from the sides of the bore, a cap member secured to the upper end of the holder bearing on the uppermost cutter member and provided with an opening for the passage of a blank to said cutter members, said cutter members provided with means holding them against relative rotation in the guideway and having central axial and aligned openings therethrough which are provided with inwardly extending cutting teeth arranged whereby the teeth of successive cutters extend progressively inwardly from the uppermost to lowermost cutter members, the spaces between the projections and the abutments in conjunction with the sides of the bore and the sides of the cutters providing plural circumferentially spaced passageways longitudinally extending at the sides of the cutter members for the clearance of chips.

2. A breaching apparatus of the class described comprising in combination, a self supporting unitary holder having a longitudinal bore therethrough, supporting means in the lower end of said bore including a plurality of circumferentially spaced abutments extending inwardly from the bore, said bore of the holder provided longitudinally thereof and above said supporting means with circumferentially spaced inwardly !extending projections the innermost sides of which are formed to cooperate and provide a circular axial guideway for cutter members and are arranged to space the sides of cutter members from the sides of said bore, a plurality of cutter members in stacked relation in said bore supported by said supporting means and held in axial alignment in said guideway by said projections whereby the sides of the cutters are spaced from the sides of the bore, a cap member secured to the upper end of the holder bearing on the uppermost cutter member and provided with an opening for the passage of a blank to said cutter members, said cutter members provided with means holding them against relative rotation in the guideway and having central axial and aligned openings therethrough which are provided with inwardly extending cutting teeth arranged whereby the teeth of successive cutters extend progressively inwardly from the uppermost to lowermost cutter members, the space between the projections and the abutments in conjunction with the sides of the bore and the sides of the cutters providing plural circumferentially spaced passageways longitudinally extending at the sides of the cutter members for the clearance of chips, the sides of said cutter members adjacent the sides of adjacent cutter members provided with circumferentially spaced radially extending grooves across said sides providing radial passageways in communication with the openings in said cutters and said first mentioned longitudinal passageways.

JOHN OAKLEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 772,841 Smith Oct. 18, 1904 FOREIGN PATENTS Number Country Date 408,992 Great Britain Apr. 23, 1934 

